// Check that the MR and N are present
assertTrue( isMatchingRulePresent( schemaManager, OID ) );
assertTrue( isNormalizerPresent( schemaManager, OID ) );
// Now try to remove the N
Normalizer normalizer = schemaManager.lookupNormalizerRegistry( OID );
// shouldn't be deleted cause there is a MR associated with it
assertFalse( schemaManager.delete( normalizer ) );
List<Throwable> errors = schemaManager.getErrors();